As everyone else has already said, I don't think they have a chance at gold. You stated you didn't want to talk about the judges holding Navka/Kostamorov up, but really, how can you not? It has been painfully obvious throughout the season that this is the new chosen couple - even when they were skating poorly at the beginning of the season - and I do mean poorly - they still ended up on top. At the GPF their dance had improved a lot, and I think it will certainly be enough for judges, already looking to put them in the top spot.
I think Belbin/Agosto actually have a good shot at the silver. Denkova/Staviski are clearly being sent some kind of message from the judges this year. They haven't been having a good season, even before the Europeans. I don't know that Grushina/Goncherov are really all that favoured either. It will be interesting to see what the judges do with them at Worlds. Chait/Sahknovsky seem to have spent their required time in the penalty box and are again on their way up, without any really noticeable improvement in their skills, unfortunately. However, I do think this team has a great chance at another bronze medal. Delobel and Schoenfelder - I love this team, but again, I don't think they are favoured by the international judges. And I adore Dubreuil and Lauzon (I am a Canadian) and love their programs this year, but I think the judges have decided with unfair finality that they will not rise much higher than sixth. I would love to see them fighting it out for bronze - and I do think they are a good enough team to be doing so, but fear they will not be, no matter what happens.